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DatoValore
TitleSubcritical Water Extraction Followed by Liquid Chromatography Mass Spectrometry for Determining Terbuthylazine and Its Metabolites in Aged and Incubated Soils
AbstractDue to the great potential of atrazine in contaminating groundwater, its use has been banned in several countries and often replaced by terbuthylazine (CBET). Little is known on the fate of CBET in soil. The purpose of this work has been (1) to develop a general method for analyzing CBET and its degradation products (DPs) in soil and (2) to use this method for elucidating the fate of CBET incubated in both surface and subsurface samples of an agricultural soil which had been receiving repeated CBET spills. This method involves analyte extraction from soil at 100°C by phosphate-buffered water. Analytes coming out of the extraction cell were collected by a graphitized carbon black extraction cartridge. After analyte elution with a suitable solvent mixture, the final extract was analyzed by LCMS. From an aged soil, our method extracted altogether quantities of CBET and its DPs respectively 2.1 and 1.4 times larger than those by two previously reported methods. For the analytes considered, limits of quantification (S/N 10) ranged between 0.22 and 5.5 ng per gram of soil. The laboratory CBET degradation experiment showed that (1) similarly to atrazine, remarkable amounts of hydroxylated metabolites were formed; (2) when the subsoil microflora was in the presence of rather large amounts of CBET, it degraded the herbicide with a rate similar to that of the topsoil microflora.
SourceEnvironmental science & technology 33 (18), pp. 3271–3277
Keywordsterbuthylazine; metabolites; soil; subsoil
JournalEnvironmental science & technology
EditorAmerican Chemical Society,, Easton, Pa., Stati Uniti d'America
Year1999
TypeArticolo in rivista
DOI10.1021/es990130b
AuthorsDi Corcia A, Barra Caracciolo A, Crescenzi C, Giuliano G, Murtas S, Samperi R
Text225416 1999 10.1021/es990130b terbuthylazine; metabolites; soil; subsoil Subcritical Water Extraction Followed by Liquid Chromatography Mass Spectrometry for Determining Terbuthylazine and Its Metabolites in Aged and Incubated Soils Di Corcia A, Barra Caracciolo A, Crescenzi C, Giuliano G, Murtas S, Samperi R Istituto di Ricerca Sulle Acque IRSA CNR , Roma Due to the great potential of atrazine in contaminating groundwater, its use has been banned in several countries and often replaced by terbuthylazine CBET . Little is known on the fate of CBET in soil. The purpose of this work has been 1 to develop a general method for analyzing CBET and its degradation products DPs in soil and 2 to use this method for elucidating the fate of CBET incubated in both surface and subsurface samples of an agricultural soil which had been receiving repeated CBET spills. This method involves analyte extraction from soil at 100°C by phosphate buffered water. Analytes coming out of the extraction cell were collected by a graphitized carbon black extraction cartridge. After analyte elution with a suitable solvent mixture, the final extract was analyzed by LCMS. From an aged soil, our method extracted altogether quantities of CBET and its DPs respectively 2.1 and 1.4 times larger than those by two previously reported methods. For the analytes considered, limits of quantification S/N 10 ranged between 0.22 and 5.5 ng per gram of soil. The laboratory CBET degradation experiment showed that 1 similarly to atrazine, remarkable amounts of hydroxylated metabolites were formed; 2 when the subsoil microflora was in the presence of rather large amounts of CBET, it degraded the herbicide with a rate similar to that of the topsoil microflora. 33 pdf articolo EnvSciTechnolDicorciaetal1999.pdf Articolo in rivista American Chemical Society, 0013 936X Environmental science technology Environmental science technology Environ. sci. technol. Environmental science technology. ES T Environmental science and technology anna.barracaracciolo BARRA CARACCIOLO ANNA